Research On Tensor Experimental Data Recording System Based On FPGA

Aero magnetic survey from the beginning measurement of the total fieldintensity, experienced measurement of horizontal and vertical gradient of the fieldintensity phase, evolved to measure magnetic gradient tensor, tensor magneticmeasurement survey as an emerging technology in recent years, for its distinctadvantages to the traditional magnetic survey methods, becomes popular withdetecting on the minerals, especially on iron mines for positioning. With thedevelopment based on tensor method for geomagnetic survey, the correspondingmagnetic measurement apparatus and data processing methods are booming. Tensorsurvey equipment of aircraft also have a variety of options, such as fixed-wing aircraft,helicopters, airships and UAVs. UAV by virtue of its good security, low noise featuresbecame best select of aircraft, but UAV also has limits, as carrying weight, carryingform, etc. This paper using the advantages of FPGA, reusable, flexible design, smallvolume, low cost and abundant internal resources, combines SOPC technology,design one tensor experimental data recording system to match up detection device,carried by UAV, to proceed on magnetic measuring, main work including:(1)Introduces the fundamentals of tensor magnetic survey, according to thetensor magnetic characteristics, design a experimental system including structure anddata recording technologies. The structure includes three component fluxgatemagnetometers and experimental assistant devices such as GPS. Design in datarecording technology about three-dimensional array structure, to achieve recording avariety of information.(2)Overall design incorporates a modular design, the system is divided into fourmodules, which are the input module, data processing and data transmission controlmodule, communication module and power supply modules. Input module analyze themain features of input, covering the magnetometers and experimental assistant device signals. Data processing and control module all designed in FPGA including magneticdata acquisition, data processing of experiment of auxiliary devices; establish multipleFIFOs and various functions within the FPGA. Data communication module researchsystems include data transmission. At last introduce the power supply module withdifferent power requirements and related chips and circuit design.(3)When recording assistant device information, because of based on tensormagnetic measuring needs getting multiple to serial for communication interfaces asGPS positioning information, and height meter information, here uses embeddedtechnology, design basing on SOPC, for more serial extended circuit, using IP core ofFPGA, dynamic extended UART, can meet more serial device for transmission.This article mainly focus on tensor experimental data recording, FPGA is as thecore of whole system, clarified tensor magnetic measuring characteristics andrelationships between micro-instrument, especially for magnetic measuring data, andauxiliary data collection established the system to meet small volume, highconsistency, light, low power, real time and miniature instruments that can be quicklyset up, meet requirements for data recording method.